JP2004304277A - Metal mold for forming diaphragm and manufacturing method of diaphragm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal mold for forming a diaphragm capable of more efficiently manufacturing the diaphragm with a voice coil integrally attached thereto without the possibility of causing a wrinkle or the like in forming the diaphragm and to provide a manufacturing method of the diaphragm using the metal mold. <P>SOLUTION: The metal mold is configured such that: a fixed metal mold 2 having a heating function, a circular-arc dome forming face 4, and a voice coil holding section 5 at the base end of the dome forming face, and a movable metal mold 10 located freely vertically movable to the fixed metal mold 2 and comprising a plurality of division bodies. The movable metal mold 10 comprises: an edge forming division body 11 in press contact with the fixed metal mold 2; a diaphragm raw material holding division body 14 arranged at the upper part of the edge forming division body 11; and a pressing division body 17 arranged at the upper part of the diaphragm raw material supporting division body 14 and having a heating function, and the voice coil is integrally fixed to the diaphragm at the same time when the diaphragm is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker for use in various types of audio equipment, a mold for forming a diaphragm, which can be integrally provided with a voice coil at the same time as the formation of the diaphragm, and a vibration using the mold. The present invention relates to a method for manufacturing a plate.
[0002]
[Prior art]
It is well known that a diaphragm and a voice coil are integrated when a diaphragm is manufactured. For example, in Japanese Unexamined Patent Application Publication No. Hei 5-37996 (Patent Document 1), eccentricity when a diaphragm and a voice coil are coupled is disclosed. A voice coil is connected to the center of the formed diaphragm in order to solve the gap defect caused by the vibration and stabilize the quality, and the outer periphery of the diaphragm is guided to a predetermined outside by guiding the inside of this voice coil as a reference. Prepare an intermediate assembly that has been punched out to the diameter dimension, and fix the peripheral edge of the diaphragm of this intermediate assembly with the inside of the diaphragm guide as a reference so that the voice coil can be inserted into the magnetic gap without eccentricity. A method for manufacturing a speaker has been proposed.
[0003]
Further, in Japanese Patent Application Laid-Open No. Hei 10-210593 (Patent Document 2), by integrating and forming a cone diaphragm and a coil bobbin, there is no need to bond the cone diaphragm and the coil bobbin, and the number of manufacturing steps can be reduced. As a method of manufacturing a speaker diaphragm that can be applied to a speaker that requires a speaker, when a speaker diaphragm is injection-molded with a synthetic resin or the like, a circle is formed on the inner peripheral side of the neck portion of the diaphragm during the injection molding. A method of arranging a voice coil bobbin having a slit on its periphery and performing insert molding to form an engaging portion that is inserted into and engaged with the slit from the neck portion, thereby integrating the diaphragm with the voice coil bobbin. Has been proposed.
[0004]
Further, Japanese Patent Application Laid-Open No. 2002-159091 (Patent Document 3) discloses a diaphragm that reduces a peak dip generated at the time of high-frequency resonance, realizes a high-output loudspeaker with little distortion, and is excellent in mass productivity. As a manufacturing method, a diaphragm is obtained by performing injection molding using a thermoplastic resin and integrally molding a dome portion, a voice coil joining portion, a cone portion, and an outer peripheral portion to which a frame is attached. At that time, by increasing the thickness of the central part of the dome to reduce the resonance amplitude of this part, and by providing an annular projection integrally with the voice coil joint, increasing the joint strength between the diaphragm and the voice coil bobbin It is stated that the electromagnetic driving force of the voice coil can be efficiently transmitted to the diaphragm, and a speaker having excellent frequency characteristics can be obtained.
[0005]
In manufacturing such a diaphragm, an injection mold as shown in FIG. 31 of Patent Document 3 is used.
[0006]
That is, this mold is composed of a heat-pressing mold that is a male mold and a heat-pressing mold that is a female mold, and the molding surfaces of the male mold and the female mold have almost the same shape. Each mold has a built-in heating heater, and each mold has a dome forming surface, a voice coil joint forming surface, a cone forming surface, and a frame pasting outer peripheral forming surface. The heated male mold is attached to the shank, and moves to the pressing position and the open position with respect to the fixed female mold. For example, in order to manufacture a dome-shaped diaphragm, a resin material is positioned on the pressurizing surface of the female mold, the heaters for both molds are energized and heated to a predetermined temperature, and then the male material is inserted through the shank. The mold is pressed, the pressure of both molds is maintained at a predetermined value, the resin material is softened and melted, and the resin material is heated and deformed into the shape of the mold forming surface.
[0007]
[Patent Document 1]
JP-A-5-37996 (Claims)
[Patent Document 2]
JP-A-10-210593 (Claims)
[Patent Document 3]
Japanese Patent Application Laid-Open No. 2002-159091 (Claims, Conventional Techniques)
[0008]
[Problems to be solved by the invention]
In any of the above-described methods for manufacturing a diaphragm integrally provided with a voice coil, a method in which the diaphragm is preliminarily molded is used. In molding the diaphragm, the above-described mold is used. Therefore, when forming the diaphragm, wrinkles and the like are likely to be generated in the diaphragm material, and since the method of bonding the diaphragm and the voice coil is adopted, the setting position of the voice coil is easily shifted, and the product varies. There is a need to provide stable quality diaphragms and to develop more efficient manufacturing means.
[0009]
SUMMARY OF THE INVENTION In view of the above situation, the present invention has no risk of wrinkles or the like when molding a diaphragm, and furthermore, it is possible to more efficiently manufacture a diaphragm integrally provided with a voice coil. It is intended to provide a mold and a method of manufacturing a diaphragm using the mold.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention
A mold that can simultaneously mold the diaphragm and voice coil together,
The mold is composed of a fixed mold and a movable mold composed of a plurality of divided bodies arranged to be vertically movable with respect to the fixed mold,
The fixed mold has a heating function, an arc-shaped dome forming surface, and a voice coil holding portion at a base end of the dome forming surface,
The movable mold includes an edge-forming divided body abutting on the fixed mold, a diaphragm material-holding divided body disposed above the edge-forming divided body, and a diaphragm material-holding divided body. A molding die for a vibration plate, comprising a pressing divided body disposed at an upper portion and having a heating function.
[0011]
The invention described in claim 2 of the present invention
The mold for molding a diaphragm according to claim 1,
The fixed mold,
A cylindrical body is erected integrally on the upper surface of the mold main body. The top of the cylindrical body is formed in an arc shape to form a dome forming surface, and a ring shape is formed on the base end of the dome forming surface. A step portion is formed on the voice coil holding portion.
[0012]
Further, the invention described in claim 3 of the present invention is:
The mold for molding a diaphragm according to claim 1,
Edge forming divided body constituting the movable mold,
It consists of a plate-like body of a required thickness having an abutment surface that is in close contact with the fixed mold, and has a through-hole through which a cylindrical body of the fixed mold is inserted at the center, and a plate-like shape along this through-hole. An edge forming portion having an arc-shaped cross section is integrally formed on the upper surface of the body so as to protrude therefrom.
[0013]
Further, the invention described in claim 4 of the present invention is:
The mold for molding a diaphragm according to claim 1,
The divided body for holding the diaphragm material constituting the movable mold,
It consists of a plate-like body having a required thickness, has a through hole in the center part through which the cylindrical body of the fixed mold is inserted, and along the through-hole, on the upper surface of the plate-like body, from the step portion Wherein the diaphragm material holding portion is integrally formed.
[0014]
Further, the invention according to claim 5 of the present invention provides:
The mold for molding a diaphragm according to claim 1,
The pressing divided body constituting the movable mold,
It is made of a plate-like body having a required thickness, and has a dome forming surface receiving portion that can receive a part other than the base end of the dome forming surface formed in the cylindrical body of the fixed mold in the lower center part, A protruding portion having a mountain-shaped cross section for forming a voice coil attachment portion is formed in a ring shape in the vicinity of the dome forming surface receiving portion, and a cross-sectional circle formed on the outer periphery of the protruding portion in the edge forming divided body. An edge forming portion that engages with the arc-shaped edge forming portion is provided.
[0015]
Further, the invention described in claim 6 of the present invention is:
In molding the diaphragm using a fixed mold and a movable mold composed of a plurality of divided bodies arranged vertically movable with respect to the fixed mold,
At the base end of the dome forming surface formed in the fixed mold, a step of engaging and holding a voice coil having an adhesive applied to the front end surface,
A step of holding a diaphragm material in a diaphragm material holding divided body located in the middle of the movable mold,
A step of pressing and holding the diaphragm material by the pressing split body and the diaphragm material holding split body disposed on the upper portion of the diaphragm material holding split body,
The pressing divided body for press-holding the diaphragm material and the diaphragm material holding divided body are pressed against the fixed mold together with the edge forming divided body disposed below the diaphragm material holding divided body, and heated. With the fixed mold and the pressing divided body, the diaphragm material is molded into a dome-shaped diaphragm, and at the same time, a dome-shaped edge is integrally molded around its periphery, and on the back surface of the joint between the diaphragm and the edge. A method for manufacturing a diaphragm, wherein a step of integrally joining and bonding the tip portions of the voice coil is performed.
[0016]
Hereinafter, a preferred embodiment of a mold for forming a diaphragm according to the present invention and a method for manufacturing a diaphragm using the mold for forming a diaphragm will be specifically described with reference to the accompanying drawings. However, the present invention is not limited only to the embodiments described below, and various changes can be made without departing from the gist of the invention.
[0017]
The mold for forming a diaphragm according to the present invention employs a movable mold corresponding to a fixed mold in order to securely press-hold the diaphragm material in advance so that no wrinkles are generated in the diaphragm material when molding the diaphragm. It has the greatest feature in that it is constituted by a plurality of divided bodies.
[0018]
That is, as shown in FIG. 1, the diaphragm forming mold 1 (hereinafter simply referred to as “molding mold”) of the present invention has a stationary mold 2 and a vertically movable upper part of the stationary mold 2. It is configured by a movable mold 10 composed of three divided bodies freely arranged.
[0019]
As is apparent from FIGS. 1 to 3, the fixed mold 2 has a cylindrical body 3 having a required diameter integrally and vertically erected at the center of the upper surface of a mold main body 2a having a required thickness. The dome-forming surface 4 is formed by forming an apex in an arc shape, and a voice coil holding portion 5 formed of a step is formed in a ring shape at the base end of the dome-forming surface 4. More specifically, The cylindrical body 3 is formed by forming a reduced diameter portion 3b from the base portion 3a via a step portion, and further forming a step portion thereover to form a voice coil holding portion 5, the upper portion of which is an arc-shaped portion. The dome forming surface 4 is used.
[0020]
In the movable mold 10 composed of three divided bodies, the first divided body is an edge forming divided body composed of a plate-shaped body 11a having a required thickness and a bottom surface 11c that is in close contact with the upper surface 2b of the fixed mold 2. The body 11 has a through hole 12 at the center thereof through which the cylindrical body 3 of the fixed mold 4 is inserted. On the opening edge of the through hole 12, an edge 13 a having an arc-shaped cross section is formed integrally with the outer periphery thereof. An edge forming portion 13 for forming a mounting portion 13b to be formed is formed in a ring shape and integrally protrudes. The lower inner peripheral surface of the through hole 12 is tightly engaged with the outer peripheral surface of the base 3 a of the cylindrical body 3, and a part of the edge forming portion 13 is located on the through hole 12.
[0021]
The second divided body is a diaphragm material holding divided body 14 disposed above the edge forming divided body 11, and is provided at the center of a plate-shaped body 14a having a required thickness. One having a through hole 15 through which the cylindrical body 3 is inserted, and a diaphragm material holding portion 16 formed of a step is integrally formed on the upper surface portion 14b of the plate-like body 14a surrounding the through hole 15. The surface of the diaphragm material holding portion 16 is provided so as to be flush with the mounting portion 13b when joined to the edge forming divided body 11 described above.
[0022]
The third divided body is a pressing divided body 17 disposed above the diaphragm material holding divided body 14. The third divided body is provided at the center of the lower surface of a plate-like body 17 a having a required thickness. A dome forming surface receiving portion 18 that can receive a portion other than the base end portion α of the dome forming surface 4 formed on the cylindrical body 3 is formed, and a voice coil is provided near the opening edge of the dome forming surface receiving portion 18. A projecting portion 19 having a mountain-shaped cross section for forming a mounting portion is formed in a ring shape. An edge forming surface 20 is formed on the outer periphery of the projecting portion 19 in the same manner as an edge forming surface 20 which is in close contact with the edge forming portion 13 having an arc-shaped cross section which is formed to project from the edge forming divided body 11. is there.
[0023]
In FIG. 1, reference numeral 21 denotes a notch step formed on the lower outer peripheral side of the plate-like body 17a and in close contact with the upper surface part 14b of the diaphragm material holding divided body 14. Also, in FIG. 1, the dome forming surface receiving portion 18 formed at the center of the lower surface of the plate-like body 17a is formed by a concave notch, but by providing a through hole from the lower surface to the upper surface, The weight of the movable mold 10 can be reduced.
[0024]
As shown in FIG. 4, the diaphragm 30 molded using the molding die 1 is formed in a dome shape having an arc-shaped or hemispherical cross section, and the opening edge of the diaphragm main body 30a. One side of the dome-shaped edge 32 is integrally connected via a voice coil mounting portion 31 having an inverted U-shaped cross section, and the diaphragm 30 is fixed to the frame on the other side of the edge mounting portion 31. The voice coil mounting portion 31 is integrally connected to the rear surface of the voice coil mounting portion 31, and the upper end of the voice coil 34 is integrally fixed by an adhesive.
[0025]
The diaphragm material C used in the present invention is a thermoplastic resin such as polyester, polypropylene, polyethylene, polystyrene, and ABS resin, and its material and thickness are appropriately determined according to the performance of a speaker to be applied. Things.
[0026]
Hereinafter, an example of a method for manufacturing a diaphragm according to the present invention will be specifically described. First, a voice coil 34 having an upper end coated with an adhesive is fixed to a fixed mold as shown in FIG. 2 is arranged in the voice coil holding part 5 formed in FIG. At this time, the edge forming divided body 11, the diaphragm material holding divided body 14, and the pressing divided body 17 constituting the movable mold 10 are all located above the fixed mold 2, and the diaphragm material holding body. There is a gap between the dividing member 14 for pressing and the dividing member 17 for pressing, at least so that the diaphragm material C can be mounted on the dividing member 14 for retaining the diaphragm material.
[0027]
Next, a diaphragm material C made of a thermoplastic resin sheet is set in a diaphragm material holding portion 16 formed of a step formed on the diaphragm material holding divided body 14, and wrinkles or looseness are applied to the diaphragm material C. After checking whether or not there is any, the pressing divided body 17 is lowered, and the diaphragm material C is clamped between the two divided bodies 14 and 17 in a tension state.
[0028]
When the press-clamping process of the diaphragm material C by the diaphragm material holding divided body 14 and the pressing divided body 17 is completed, the divided bodies 14 and 17 are further lowered in the direction of the fixed mold 2 to perform edge forming division. When it is further pressed downward while being integrated with the body 11, the dome forming surface 4 of the cylindrical body 3 of the fixed mold 2 enters into the through hole 12 of the lowermost edge forming divided body 11.
[0029]
Further, when the movable mold 10 is lowered, the dome forming surface 4 penetrates through the through-hole 12 and enters the through-hole 15 of the diaphragm material holding divided body 14 to move the center of the diaphragm material C to the center. While being lifted upward, the dome forming surface 4 enters into the dome forming surface receiving portion 18 of the pressing divided body 17, so that the bottom surface 11 c of the edge forming divided body 11 comes into close contact with the upper surface 2 b of the fixed mold 2. The movable mold 10 is lowered until it comes into contact with the movable mold 10, and the entire movable mold 10 is pressed onto the fixed mold 2.
[0030]
While the movable mold 10 is descending, the diaphragm material C is gradually molded into a dome shape by the dome forming surface 4 of the fixed mold 2, and the voice coil mounting portion 31 and the edge 32 are simultaneously molded. When the bottom surface portion 11c of the edge forming divided body 11 is in close contact with the upper surface portion 2b of the stationary mold 2, the voice coil mounting portion 31 and the front end portion of the voice coil 34 come into close contact with each other, and the front end portion of the voice coil 34. , The voice coil 34 is integrally fixed to the voice coil mounting portion 31.
[0031]
Note that the pressing mold 17 of the fixed mold 2 and the movable mold is heated by a built-in heating body (not shown) in advance, or in accordance with the contact of the dome forming surface 4 with the diaphragm material C. When the molding of the diaphragm 30 by pressurizing and heating is completed, the movable mold 10 is lifted upward, and the divided bodies 11, 14, 17 are separated from each other. The molded vibration plate 30 is taken out from above the 14.
[0032]
As described above, an example of the method of manufacturing the diaphragm according to the present invention has been described. In forming the diaphragm, the diaphragm material C is pre-pressed and sandwiched between the diaphragm material holding divided body 14 and the pressing divided body 17. After the process, there may be some cases in the procedure described above, and the point is that the voice coil 34 can be integrally fixed to the diaphragm 30 at the same time as the formation of the diaphragm 30.
[0033]
【The invention's effect】
A mold for forming a diaphragm according to the present invention includes an arc-shaped dome-forming surface, a fixed mold having a voice coil holding portion at a base end of the dome-formed surface, and an edge forming contact with the fixed mold. A divided body, a diaphragm material holding divided body arranged above the edge forming divided body, and a pressing divided body arranged above the diaphragm material holding divided body and having a heating function. Since the movable mold is configured and the movable mold is arranged vertically movable with respect to the fixed mold, the diaphragm material can be molded into a dome shape without generating wrinkles or the like on the diaphragm material. it can.
[0034]
In particular, in the molding die of the present invention, the movable die is composed of a plurality of divided bodies as described above, the diaphragm material is molded into a dome shape, and the voice coil is integrated with a required portion of the diaphragm. It is possible to stably produce a diaphragm of constant quality without any displacement of the set position of the voice coil.
[0035]
Also, the method for manufacturing a diaphragm according to the present invention may further comprise a dome-forming surface having an arc shape, a fixed mold having a voice coil holding portion at a base end of the dome-formed surface, and an edge forming contact with the fixed mold. The divided body, the diaphragm material holding divided body disposed above the edge forming divided body, and the pressing divided body having a heating function, which is disposed above the diaphragm material holding divided body and has a heating function When the diaphragm material is formed into a dome shape using a movable mold, the diaphragm material is pre-pressed and clamped so that wrinkles do not occur in the diaphragm material, and then the diaphragm material is molded into a dome shape. The quality of the diaphragm can be always constant, and the voice coil can be fixed to a predetermined portion without displacing the voice coil simultaneously with the molding of the diaphragm, so that the diaphragm can be efficiently mass-produced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of a mold for molding a diaphragm according to the present invention.
FIG. 2 is an explanatory view showing a state in which a diaphragm is molded by a molding die shown in FIG. 1;
FIG. 3 is an enlarged view showing a main part of the molding die shown in FIG.
FIG. 4 is a cross-sectional view of a diaphragm molded by the molding die shown in FIG.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 molding die 2 fixing die 3 cylindrical body 4 dome forming surface 5 voice coil holding unit 10 movable die 11 edge forming divided body 12 through hole 13 edge forming unit 14 diaphragm material holding divided body 15 through hole 16 Vibration plate material holding portion 17 Pressing split body 18 Dome forming surface receiving portion 19 Projection portion 20 for forming voice coil mounting portion Edge forming surface 30 Vibrating plate 30a Vibrating plate main body 31 Edge mounting portion 32 Edge 33 Frame mounting portion C Vibration Board material

Claims (6)

A mold that can simultaneously mold the diaphragm and voice coil together,
The mold is composed of a fixed mold and a movable mold composed of a plurality of divided bodies arranged to be vertically movable with respect to the fixed mold,
The fixed mold has a heating function, an arc-shaped dome forming surface, and a voice coil holding portion at a base end of the dome forming surface,
The movable mold includes an edge-forming divided body abutting on the fixed mold, a diaphragm material-holding divided body disposed above the edge-forming divided body, and a diaphragm material-holding divided body. A mold for forming a diaphragm, comprising a pressing divided body disposed on an upper portion and having a heating function. The fixed mold,
A cylindrical body is integrally erected on the upper surface of the mold main body, and the top of the cylindrical body is formed in an arc shape to form a dome forming surface, and a ring-shaped is formed at the base end of the dome forming surface. 2. The mold for forming a diaphragm according to claim 1, wherein a step portion is formed in the voice coil holding portion. Edge forming divided body constituting the movable mold,
It consists of a plate-like body of a required thickness having an abutment surface that is in close contact with the fixed mold, and has a through-hole through which a cylindrical body of the fixed mold is inserted at the center, and a plate-like shape is formed along this through-hole. The mold for molding a diaphragm according to claim 1, wherein an edge forming portion having an arc-shaped cross section is integrally formed on an upper surface of the body. The divided body for holding the diaphragm material constituting the movable mold,
It is made of a plate-like body having a required thickness, and has a through hole at the center portion for inserting the cylindrical body of the fixed mold, and an upper portion of the plate-like body along this through-hole, and a step portion. The diaphragm forming die according to claim 1, wherein the diaphragm material holding portion is formed integrally. The pressing divided body constituting the movable mold,
A dome forming surface receiving portion that can receive a part other than the base end of the dome forming surface formed on the cylindrical body of the fixed mold at the lower central portion, which is formed of a plate-like body having a required thickness, A convex section having a mountain-shaped cross section for forming a voice coil mounting section is formed in a ring shape in the vicinity of the dome forming surface receiving section, and a cross-sectional circle formed on the outer periphery of the projecting section in the edge forming divided body. The mold for molding a diaphragm according to claim 1, further comprising an edge forming portion that engages with the arc-shaped edge forming portion. In molding the diaphragm using a fixed mold and a movable mold composed of a plurality of divided bodies arranged vertically movable with respect to the fixed mold,
At the base end of the dome forming surface formed in the fixed mold, a step of engaging and holding a voice coil having an adhesive applied to the front end surface,
A step of holding a diaphragm material in a diaphragm material holding divided body located in the middle of the movable mold,
A step of pressing and holding the diaphragm material by the pressing split body and the diaphragm material holding split body disposed on the upper portion of the diaphragm material holding split body,
The pressing divided body for press-holding the diaphragm material and the diaphragm material holding divided body are pressed against the fixed mold together with the edge forming divided body disposed below the diaphragm material holding divided body, and heated. With the fixed mold and the pressing divided body, the diaphragm material is molded into a dome-shaped diaphragm, and at the same time, a dome-shaped edge is integrally molded around its periphery, and on the back surface of the joint between the diaphragm and the edge. A method for manufacturing a diaphragm, wherein a step of integrally bonding and bonding the end portions of the voice coil is performed.

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